Abrading device



N. H. KNOWLTON ABRADING DEVICE Filed Agg. 16, 1934 Figi'.

Patented Oct. 27, 1936 UNETED STAT @ICE ABRADING DEVICE Application August 16, 1934, Serial No. 740,135

14 Claims. (Cl. 51-190) This invention relates to abrading tools and is herein illustrated and described as embodied in'afscouring device of a type used in operating upon heel breast surfaces. For an example of such a Vdevice reference may be had to United States Letters Patent No. 2,018,671 granted October 29, 1935 upon the application of James L. Hildebrand. That patent discloses an abrading tool consisting of a sleeve vof abrasive material which is yieldably supported upon a plurality of resilient wires extending within the sleeve. The tool disclosed in the present application, in so far as the abrasive sleeve and the yieldable supporting structure are concerned, is substantially like that of the above-mentioned patent.

It is an object of the present application to provide an improved arrangement for securing an abrasive element upon a supporting member. In accordance with a feature of the invention, there is provided a tubular shaft having secured within it an abrasive sleeve with a portion of the abrasive sleeve projecting from an open end of the shaft, The abrasive sleeve, as illustrated, is supported by a member carried Within the tubular shaft, and mechanism is provided co-operating with the tubular shaft to clamp the abrasive element in position with respect to the supporting member. In the illustrated arrangement the clamping mechanism is operated by sliding it longitudinally within the tubular shaft, cam means being provided for moving the clamping members radially into clamping position upon longitudinal movement of the clamping members. In one form of the invention `illustrated herein, a cam surface is formed on the tubular shaft for forcing the clamping members inwardly to clamp the abrasive sleeve against the supporting member. In another form, a cam surface is formed on the supporting member for forcing the clamps outwardly to clampthe abrasive sleeve against the interior of the tubular shaft.

The invention further consists of various features of construction and combinations of parts herein disclosed and claimed, the advantages of which will be apparent to those skilled in the art, reference being had to the accompanying drawing,

in which Fig. l is a View in side elevation 0f a machine embodying the invention;

Fig. 2 is an enlarged sectional view showing in detail one of the preferred forms of the novel arrangement for securing an abrasive sleeve upon a tool body;

Fig. 3 is a view similar to Fig. 2 showing an a1.

ternative arrangement for securing an abrasive sleeve upon a tool body; and

Fig. 4 is a sectional view taken on the line IV-IV of Fig. 3.

The supporting structure of the abrading ma- 5 chine disclosed herein consists of a frame or standard I0 having a base portion adapted to be secured upon a work bench or other suitable support. Upon the upper portion of the standard i6 is a housing l2 for ball bearings I4. While lo only one set of ball bearings I4 is shown at one end of the housing I2 in Fig. 1. another set is also carriedwitliin and at the other end of the housing. Rotatably mounted in the above-mentioned ballbearings is a tubular shaft in the form lo of a rigid metal sleeve I6 upon an end portion of which is secured a pulley i8 driven by a belt 26 from any suitable source of power.

Slidably carried within the sleeve I6 is a rod 24 having a reduced end portion 26 into which is threaded an extension 2l' of a hub 28. A plurality of resilient wires 30 which tend to expand extend within an abrasive tube or sleeve 32 have their end portions secured against the hub 28 by a collar 34. The abrasive sleeve 32 is yieldably 25 supported in its action upon the work by the Wires 36. The hub 28 carries a tapered extension 36 which prevents excessive yielding of the wires 30 under pressure of the work. The abrasive sleeve 32, hub 28, the Wires 30, the collar 34, and the extension 36 are similar to corresponding elements of the tool disclosed in the above-mentioned patent, and together with the rod 24 constitute a rotary tool body. The rod 24 carries a pair of clamping bars 3 8, each of which has a lug 40 extending into a recess 42 formed in the rod 24 to prevent endwise movement of the clamping bars 38 relatively to the rod 24. Two lengthwise grooves 44 are formed in the rod 24 for receiving the bars 38, the outer ends of which extend over the inner end of the abrasive sleeve 32. Each of vthe bars 38 has a tapered or wedge- Shaped outer surface 46 which cooperates with a'frusto-conical cam surface 48 formed internally upon the adjacent end of the sleeve I6.

A compression spring 50 which is contained within a diametrical bore 52 in the bar24 tends to separate the bars 38 and to hold the wedge surfaces 46 against the frusto-conical surface 48. Threaded 'into' the. opposite end of the rod 24 is a screw 54 having a. knurled head 56. Adjacent to the head 56 is a hub having a groove 58 into which extend a pair of pins 60 which are threaded through the hub of the pulley i8 and which extend through the sleeve I6. The pins 66 thus serve to transmit the drive of the pulley I8'into the sleeve I6 and also to hold the screw 54 against endwise movement relatively to the sleeve I6. It is evident that turning of the knurled head in one direction will draw the rod 24 to the right (as viewed in Fig. l), causing the wedge surfaces 46 as they react against the frusto-conical surface 48 to be urged radially inwardly, thus causing the outer ends of the clamping bars 38 to clamp the abrasive sleeve 32 against the sleeve 34. Movement of the knurled head 58 in the opposite direction will move the rod 24 to the left, enabling the spring 50 to separate the bars 38, thereby releasing the clamping pressure upon the abrasive sleeve 32. In order to transmit rotation from the shaft I 6 to the tool body, and also to prevent turning of the rod 24 with the screw 54, there is formed in the rod 24 a longitudinal slot 94 which slidably engages the tip of a screw 92 which is carried by a collar 22 on the shaft I6.

In the construction disclosed in Figs. 3 and 4, there is provided a tubular shaft in the form of a sleeve 62 having secured thereon a pulley 64. The sleeve 62 and the pulley 84 are mounted and driven in a manner similar to that of the sleeve I6 and the pulley I8 of the arrangement shown in Figs. 1 and 2. Within the sleeve 62 and secured thereto by a screw 66 adjacent to an end portion of the sleeve is a rod 68. As shown in Fig. 3, the rod 68 is spaced from the sleeve 62 except for a headed end portion I0 into which the screw 66 extends. Three longitudinally extending grooves I2 (Fig. 4) are formed in the rod 68 to receive three clamping bars 14. Suitable openings are formed in the head 'I0 to enable the bars I4 to extend beyond that end of thev rod 68, and the three bars 'I4 at their end portions are secured together by a head 'I6 outside the sleeve 62, thereby insuring that the three bars will move in unison. Adjacent to its opposite end the rod 68 has formed upon it a frusto-conical cam surface yielding of the wires 84.

'I8 adapted to be engaged by the ends of the bars T4. Beyond the cam surface I8 the rod 62 is provided with threads 80 for engaging an internally threaded hub 82 of a supporting structure for an abrasive sleeve, which structure is similar to that disclosed in Fig. 2 and has similar resilient wires 84 and a similar collar 86 for securing the Wires 84 against the hub 82. The hub 82 also has a tapered extension 88 for preventing excessive The above-described supporting structure, together with the rod 68 constitutes a rotary tool body. Mounted upon the Wires84 and extending into the space between the rod 68 and the interior of the sleeve 62 is anv abrasive sleeve 90. It is evident that movement of the head 'I6 toward the left will cause the free ends of the clamping bars I4 to ride up on the cam surface 'I8 and thereby to clamp the abrasive 'sleeve against the interior of the sleeve 62, and a movement of the head 'I6 in the opposite direction will serve to unclamp the abrasive sleeve.

In using an abrasive sleeve upon tools of the character disclosed herein, it is only the end portion of the too-l which receives any considerable degree of wear and it is desirable, in order to save theabrasive material, to unclamp thefabrasive sleeve and draw it out far enough to expose a fresh abrasivef surface and then to out off the used end. rBoth ofthe clamping arrangements disclosed herein enable this-operation to be performed very readily. The form disclosed in Figs. 3 :and 4' has the further desirable advantage of enabling-an exceptionally long abrasive sleeve to be used, thereby affording the advantage Of wasting a minimum of the abrasive material and of requiring only infrequent replacement of the abrasive sleeve.

Having described the invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. An abrading device comprising a tubular shaft having an open end, and an abrasive sleeve secured within said tubular shaft with a portion of said abrasive sleeve extending from the open end of the tubular shaft.

2. An abrading device comprising a tubular shaft having an open end, an abrasive sleeve within said tubular shaft with a portion of the abrasive sleeve extending from the open end of the shaft, and a clamping mechanism constructed and arranged to secure said abrasive sleeve in said position relatively to said tubular shaft.

3. A rotary abrading device comprising a driven tubular shaft, a member carried within and supported by said tubular shaft for supporting an abrasive sleeve, and clamping mechanism for seabrasive sleeve, a plurality of members within said tubular shaft and slidable axially with respect thereto for clamping an abrasive sleeve in position with respect to said supporting member, an operating member extending outside of said shaft for imparting axial movement Ito said clamping members, and cam means constructed and arranged to cause said clamping members to move radially into clamping position upon axial movement of said clamping members.

5. An abrading device comprising a rigid sleeve, a member carried within said rigid sleeve for supporting an abrasive element, means for securing said rigid sleeve and said supporting member against relative rotation, and means extending within said rigid sleeve and operable upon longitudinal movement with respect thereto to clamp an-abrasive element in position with respect to said supporting member.

6. An. abrading device comprising a sleeve of abrasive sheet material, a rotary tool body having a plurality of wires extending within said abrasive sleeve yieldingly to support the same, mechanism for clamping said abrasive sleeve in position upon said tool body, and a cam for operating said clamping mechanism.

7. An abrading device comprising a sleeve of abrasive sheet material, a rotary tool body having a plurality of Wires extending within said abrasive sleeve yieldingly to support the same, a rigid sleeve surrounding an end portion of said abrasive sleeve, and a cam-operated mechanism constructed and arranged to cooperate with said rigid sleeve to clamp said abrasive sleeve in position upon said tool body.

8. An abrading device comprising a rotary tool body, a sleeve of abrasive sheet material mounted on said tool body, a rigid sleeve within which said tool body is slidably mounted, a pair of diametrically opposed clamps carried by said tool body and extending over said abrasive sleeve, said clamps being movable radially with respect to said tool body but being held against axial movement relatively to said tool body, means for urging saidy clamps apart, said clamps and said rigid sleeve having cooperating Wedge-shaped surfaces adapted to bring said clamps into clamping engagement With said abrasive sleeve upon axial movement of said tool body, and means for moving said tool body axially to effect clamping and unclamping of said abrasive sleeve.

9. A rotary abrading machine comprising a driven tubular shaft, a bearing for said shaft, driving means for said shaft, a member carried Within said tubular shaft and movable longitudinally with respect thereto for supporting an abrasive sleeve, mechanism carried by said supporting member for clamping an abrasive sleeve against said supporting member, and means for moving said supporting memberV longitudinally With respect to said tubular shaft, said tubular shaft and said clamping mechanism being constructed and arranged to cause operation of said clamping mechanism as the clamping mechanism moves longitudinally with said supporting member.

10. An abrading device comprising a rotary tool body having a cam surface formed thereon, a rigid sleeve surrounding said tool body and secured thereto, an abrasive sleeve mounted on said tool body and extending between said tool body and said rigid sleeve, and a plurality of clamping members slidably mounted on said tool body and constructed and arranged to exert an out- Ward clamping pressure to clamp said abrasive sleeve against the interior of said rigid sleeve when said clamping members are moved axially against said cam surface.

11. A rotary abrading machine comprising a tubular shaft, a bearing for said shaft, driving means for said shaft, a member carried by said tubular shaft for supporting an abrasive sleeve, and mechanism for clamping an abrasive sleeve on said supporting member against the interior of said tubular shaft.

12. A rotary abrading machine comprising a tubular shaft, a bearing for said shaft, driving means for said shaft, a member carried by said tubular shaft for supporting an abrasive sleeve, a plurality of clamping members, and a cam Within said tubular shaft, said cam and said clamping members being constructed and arranged to cause the clamping members to clamp an abrasive sleeve against the interior of sai-d tubular shaft upon relative axial movement between said cam and said clamping members.

13. An abrading device comprising an elongated abrasive tube having a Working end portion, the remaining length of the tube constituting reserve material to be advanced progressively as the Working end portion is used up, means for supporting the Working end portion of said abrasive tube against the pressure of the work, an elongated sleeve into which the reserve portion of the abrasive tube extends, and means within said sleeve for securing said abrasive tube against movement relatively to said supporting means.

14. An abrading device comprising an elongated abrasive tube having a Working end portion, the remaining length of the tube constituting reserve material to be advanced progressively as the working end portion is used up, means for supporting the Working end portion of said abrasive tube against the pressure of the work, a tubular shaft into which the reserve portion of the abrasive tube extends, and means Within said shaft for securing said abrasive tube against movement relatively to said supporting means, said securing means being readily releasable to enable a fresh portion of said abrasive tube to be advanced into Working position when the Working end portion is use-d up.

NORWOOD H. KNOWLTON. 

